I tested the latest version of Len against quite a few characters, and I have to admit that she is ver strong indeed, but not as strong as I expected. Perhaps my expectations were far too high?Either way there are quite a few characters she cannot kill, like Alsiel, ONI-MIKO-R, HReimu. However she did kill ONI-MIKO-C before the match even began, which was quite unexpected.\r
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Anyways, as you can see from this battle, it appears to be an endless one.